This is an old trick I learned a long time ago. I thought everyone knew about it, but when I show it to someone, they're usually fascinated by it. I'm sure many of you will know it, but to those who don't, this is right up there with the pea shooter, spitwad, and paper footballs. It is still always entertaining to show others how to make one since it is so simple, then pop them when they least expect it and watch them jump.
No tools are required. All you need is a used up chapstick tube with the cap.
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